Petehs



(No Model.)

F MURPHY Peed Pump for Boilers. No. 233,791. Patented Oct. 26, $880,

INVENTOR WITNES TTORNEYS.

NJETERS. FHOTO-UTHOGRAPHER. WAS

V UNITED STATES FRANCIS MURPHY, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND DAVID JONES, OF SAME PLACE.

FEED-PUMP FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 233,791, dated October 26, 1880.

Application filed March 20, 1880.

To all whom it may concern:

Be it known that I, FRANCIS MURPHY, of the city, county, and State of New York, have invented a new and Improved Feed-Pump for Boilers, of which the following is a specification.

The object of this invention is to provide an improved apparatus for forcing exhaust-steam from engine into boiler.

The invention consists of two vertical cylinders with pistons working within them, each one having two suction and two discharge openings, making four suctions and four discharges in all. The suction-pipes connect with a closed tank, into which the engine exhausts, a check-valve preventing the passage of the exhaust-steam back to the engine. The upper discharge pipes of these cylinders connect separately with the lower discharge-pipes, thus making two pairs of pipes, which pairs have separate pipe-connections with. a heater on the upper part of a steam-boiler, each separate pipe-connection being provided with a checkvalve outside of said heater, thereby cutting 0E all back-pressure between the heater and pump. The steam that drives the engine passes from the boiler to the engine through this heater, so that said steam is hot and dry, and thereby heats to the desired point the exhaust-steam that is forced into said heater by the action of the pump. Hence it is that the exhaust-steam from an engine is returned again K to operate the engine without condensing during its circulation from and back to said ensst e- Figure 1 1s a front elevation of the pump. Fig. 2 is a vertical sectional side elevation on line as m, Fig. 1.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the bed-plate of the pump; B, the standards, supporting on their tops the double-crank shaft 0, on which are keyed the fly-wheels D D and driving-pulleys E E.

FF are the two upright pump-cylinders, secured side by side to the bed-plate A, each cylinder F F having an upper and lower valved supply-pipe, G G, on one side and an upper and lower discharge-pipe, H H, on the oppo- (N0 model.)

site side, as shown, each pipe being provided with check-valves a a I) b, respectively. Each cylinder F F is provided with a piston, I, whose rod 1 passes up through a stuffing-box, J, in the cylinder-head and connects with a pitman, K, whose upper end is secured on the crank-shaft O.

L L are guide-rods projecting upward from said cylinders F F, 011 which rods L L slide the cross-heads M M that embrace the pistonrods 1 I.

The pump herein described is run by belts from the engine passing over the driving-pulleys E E, the said cylinders F F operating alternately, or the said pistons I I alternating with each other in their up-and-down strokes.

In operating this device it is designed that the engine shall exhaust into a closed tank, whence the exhaust-steam is prevented from returning to the engine by suitable valves. The pump, having had suitable connections made with the steam-exhaust tank on one side and with the boiler-heater on the other side, and being put in motion, makes two strokes to one of the engine and draws from the steamexhaust tank through the supply-pipe G G the exhaust-steam as fast as said steam is exhausted from said engine, so that said steam shall have little or no time to further condense within said tank, and delivers said exhaust- 8o steam through the discharge-pipes I I into the steam-heater, as hereinbefore set forth. The valves a a b b, respectively in the supply and discharge pipes G G I I, operate to prevent back-pressure from pump to exhaust-steam tank and from heater to the pump-cylinders. Under these conditions this pump runs with verylittle expenditure of the engines power, as the exhaust-steam enters the pump-cylinders at nearly the pressure at which it escapes from the engine and operates with the full effect of this pressure in moving the pistons of the pump; hence the power given to the pump by the engine is only auxiliary, and the return of the exhaust-steam to the boiler at the high 5 temperature at which it may be returned by means of this device effects great economies in the fuel used to maintain steam in the boiler.

This pump may be used with great advantage in distilleries, oil-refineries, or other places 1 oo and lower valved supply-pipes G G on one side and on the other correspondingly-valved disoh urge-pipes H H,whereby different kinds of 1 5 liquid may be independently pumped and the exhaust-steam taken from an engine and forced into a boiler Without the intervention of water, as specified.

FRANCIS MURPHY.

Witnesses:

I. I. STORER, C. SEDGWICK. 

